Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean
The Arctic Circumpolar Boundary Current (ACBC) transports a vast amount of mass and heat around cyclonic gyres of the deep basins, acting as a narrow, topographically-controlled flow, confined to the continental margins. Current observations during 2002–2011 at seven moorings along the major Atlanti...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/386586/ |
id |
ftsouthampton:oai:eprints.soton.ac.uk:386586 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:386586 2023-07-30T03:59:55+02:00 Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean Pnyushkov, Andrey V. Polyakov, Igor V. Ivanov, Vladimir V. Aksenov, Yevgeny Coward, Andrew C. Janout, Markus Rabe, Benjamin 2015-07 https://eprints.soton.ac.uk/386586/ English eng Pnyushkov, Andrey V., Polyakov, Igor V., Ivanov, Vladimir V., Aksenov, Yevgeny, Coward, Andrew C., Janout, Markus and Rabe, Benjamin (2015) Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 101, 80-97. (doi:10.1016/j.dsr.2015.03.001 <http://dx.doi.org/10.1016/j.dsr.2015.03.001>). Article PeerReviewed 2015 ftsouthampton https://doi.org/10.1016/j.dsr.2015.03.001 2023-07-09T22:04:12Z The Arctic Circumpolar Boundary Current (ACBC) transports a vast amount of mass and heat around cyclonic gyres of the deep basins, acting as a narrow, topographically-controlled flow, confined to the continental margins. Current observations during 2002–2011 at seven moorings along the major Atlantic Water (AW) pathway, complemented by an extensive collection of measured temperatures and salinities as well as results of state-of-the-art numerical modeling, have been used to examine the spatial structure and temporal variability of the ACBC within the Eurasian Basin (EB). These observations and modeling results suggest a gradual, six-fold decrease of boundary current speed (from 24 to 4 cm/s) on the route between Fram Strait and the Lomonosov Ridge, accompanied by a transformation of the vertical flow structure from mainly barotropic in Fram Strait to baroclinic between the area north of Spitsbergen and the central Laptev Sea continental slope. The relative role of density-driven currents in maintaining AW circulation increases with the progression of the ACBC eastward from Fram Strait, so that baroclinic ACBC forcing dominates over the barotropic in the eastern EB. Mooring records have revealed that waters within the AW and the cold halocline layers circulate in roughly the same direction in the eastern EB. The seasonal signal, meanwhile, is the most powerful mode of variability in the EB, contributing up to ~70% of the total variability in currents (resolved by moorings records) within the eastern EB. Seasonal signal amplitudes for current speed and AW temperature both decrease with the eastward progression of AW flow from source regions, and demonstrate strong interannual modulation. In the 2000s, the state of the EB (e.g., circulation pattern, thermohaline conditions, and freshwater balance) experienced remarkable changes. Results showing anomalous circulation patterns for an extended period of 30 months in 2008–2010 for the eastern EB, and a two-core AW temperature structure that emerged in this region of ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean Fram Strait laptev Laptev Sea Lomonosov Ridge Spitsbergen University of Southampton: e-Prints Soton Arctic Arctic Ocean Laptev Sea Deep Sea Research Part I: Oceanographic Research Papers 101 80 97 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
The Arctic Circumpolar Boundary Current (ACBC) transports a vast amount of mass and heat around cyclonic gyres of the deep basins, acting as a narrow, topographically-controlled flow, confined to the continental margins. Current observations during 2002–2011 at seven moorings along the major Atlantic Water (AW) pathway, complemented by an extensive collection of measured temperatures and salinities as well as results of state-of-the-art numerical modeling, have been used to examine the spatial structure and temporal variability of the ACBC within the Eurasian Basin (EB). These observations and modeling results suggest a gradual, six-fold decrease of boundary current speed (from 24 to 4 cm/s) on the route between Fram Strait and the Lomonosov Ridge, accompanied by a transformation of the vertical flow structure from mainly barotropic in Fram Strait to baroclinic between the area north of Spitsbergen and the central Laptev Sea continental slope. The relative role of density-driven currents in maintaining AW circulation increases with the progression of the ACBC eastward from Fram Strait, so that baroclinic ACBC forcing dominates over the barotropic in the eastern EB. Mooring records have revealed that waters within the AW and the cold halocline layers circulate in roughly the same direction in the eastern EB. The seasonal signal, meanwhile, is the most powerful mode of variability in the EB, contributing up to ~70% of the total variability in currents (resolved by moorings records) within the eastern EB. Seasonal signal amplitudes for current speed and AW temperature both decrease with the eastward progression of AW flow from source regions, and demonstrate strong interannual modulation. In the 2000s, the state of the EB (e.g., circulation pattern, thermohaline conditions, and freshwater balance) experienced remarkable changes. Results showing anomalous circulation patterns for an extended period of 30 months in 2008–2010 for the eastern EB, and a two-core AW temperature structure that emerged in this region of ... |
format |
Article in Journal/Newspaper |
author |
Pnyushkov, Andrey V. Polyakov, Igor V. Ivanov, Vladimir V. Aksenov, Yevgeny Coward, Andrew C. Janout, Markus Rabe, Benjamin |
spellingShingle |
Pnyushkov, Andrey V. Polyakov, Igor V. Ivanov, Vladimir V. Aksenov, Yevgeny Coward, Andrew C. Janout, Markus Rabe, Benjamin Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
author_facet |
Pnyushkov, Andrey V. Polyakov, Igor V. Ivanov, Vladimir V. Aksenov, Yevgeny Coward, Andrew C. Janout, Markus Rabe, Benjamin |
author_sort |
Pnyushkov, Andrey V. |
title |
Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
title_short |
Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
title_full |
Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
title_fullStr |
Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
title_full_unstemmed |
Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean |
title_sort |
structure and variability of the boundary current in the eurasian basin of the arctic ocean |
publishDate |
2015 |
url |
https://eprints.soton.ac.uk/386586/ |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Arctic Ocean Fram Strait laptev Laptev Sea Lomonosov Ridge Spitsbergen |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait laptev Laptev Sea Lomonosov Ridge Spitsbergen |
op_relation |
Pnyushkov, Andrey V., Polyakov, Igor V., Ivanov, Vladimir V., Aksenov, Yevgeny, Coward, Andrew C., Janout, Markus and Rabe, Benjamin (2015) Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 101, 80-97. (doi:10.1016/j.dsr.2015.03.001 <http://dx.doi.org/10.1016/j.dsr.2015.03.001>). |
op_doi |
https://doi.org/10.1016/j.dsr.2015.03.001 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
101 |
container_start_page |
80 |
op_container_end_page |
97 |
_version_ |
1772810623374065664 |